build: plugins: Allow plugin env var override

Newton uplift [1] silently disabled env var overrides for the
PLUGINS var, breaking Armband plugin selection.

Proposed fix: only set this var when not already set.

[1] https://gerrit.opnfv.org/gerrit/#/c/23433/

JIRA: ARMBAND-118

Change-Id: I143fc79de26cc9a3b66a177ca905984989bf4a9d
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/build/f_isoroot/Makefile b/build/f_isoroot/Makefile
index a011000..22a99ab 100644 (file)
--- a/build/f_isoroot/Makefile
+++ b/build/f_isoroot/Makefile
@@ -11,7 +11,7 @@
 # Add Fuel plugin build targets here
 # Plugins disabled for the Fuel Newton uplift. Please re-enable your plugin as you have
 # verified it!
-PLUGINS = f_ovs-nsh-dpdk-pluginbuild f_vsperfpluginbuild f_kvm-pluginbuild f_yardstick-pluginbuild
+PLUGINS ?= f_ovs-nsh-dpdk-pluginbuild f_vsperfpluginbuild f_kvm-pluginbuild f_yardstick-pluginbuild
 export PLUGINS
 NON_10-0_REBASED_PLUGINS = f_odlpluginbuild f_onosfwpluginbuild f_ovsnfv-dpdk-pluginbuild f_vsperfpluginbuild f_bgpvpn-pluginbuild